A pesticidal composition comprising [2,5-dioxo-3-(2-propynyl)-1-imidazolidinyl]methyl 3-(2-methyl-1-propenyl)-2,2-dimethylcyclopropanecarboxylate and 4-methoxymethyl-2,3,5,6-tetrafluorobenzyl 3-(2-cyano-1-propenyl)-2,2-dimethylcyclopropanecarboxylate as active ingredients, and a pests-controlling method characterized by applying an effective amount of said pesticidal composition to the pests or a locus where the pests inhabit, have an excellent controlling effect on the pests.
